Friction device for shuttles



Patented Apr. 23, 1929.

UNITED STATES HARRY A. DAVOL, or METHUEN, MASSACHUSETTS, .ASSIGNOR tron. sfBoBBIN &-

on rnovrnnnon, nnonn rsnannn CORPORATION or RHODE SHUTTLE co, ISLAND.

Application filed April 19,

This invention is a friction deviceifor shuttle threader blocks such as are used in shut tles particularly those otthe self threz'iding' type. g

It is particularly useful because of the compactness and ready adjustability of its parts whereby in the same shuttle very tine. fragile yarn or thread can be used, or relatively coarse strong thread. litany of the parts break or become useless, in most cases they can be removed without taking the shuttle block out of the shuttle, but in every case all of the friction parts on which. there is any wear can be readily removed and replaced by others. I

I am aware that there are a nun' ber of triction devices which include Friction plates, at

spring and an adjusting screw but I believe my device is simpler, more easily repaired and less likely to get out ()ili order-than any; others. In the drawings, Fig. 1 aplan view of av shuttle with my device .in place, part being broken away to show the construction.

. Fig. 2 isan elevation oi? a shuttleblock with my device shown as removed from the shuttle, viewed l ronrthe side opposite the shuttle eye.

Fig. 3 is a :lron't elevation as from the left oi? F 2.

Fig. 4; a view similar to a slight modification.

Fig. 5 is a view similar to lication. I

In the accompanyingdrawings indicates the body of a shuttle having a bobbin recess 1, inwhich is positioned the bobbin B ot the usual kind and from which the thread Y extends through the threader block It in substantially the usual manner. .There is the usual lilllOtltllllg chamber 4% in the wood; and the correspomiing threzuling chamber 5' in the threading block.

In the types shown in Figs. 1. to i the top ct this blockR serves as a guide and slopes downward at 2lfto a front guide 23, and 'at the back to a back hook or back guide 22in a well known manner, and across and down over the longitudinal middle line of the shuttle'. a

The horn 32 is of the usual construction F i 2 showin Fig.2'o'l a. modithrough hole 4-5.

spring B can be altered as desired.

PATENT OFFICE.

FRICTION DEVICE FOR srm'rrtns.

1927.. Serial No. 185,001.

and the thread pin may be vertical or may slope down and back to help keep the yarn F may be of hard steel or a cylindrical piece of glass, felt or intact any other suitable material extending transversely across the lower part of the'threader block through the hole 2% which as shown isdirectly under the threaded screw pin head hole 25.

It is obvious that when this friction pin F becomes worn at the top,it can be taken out and replaced by another merely by removing the threader block and knocking it out, or it may be knocked out and turned and then re placed. I V I The top friction is a plate H, preferably of sheet metal, which is flat at the bottom, and there rests on friction pin Fa'nd then extends toward the side where its horizontal edge 40 is preferably straight so that it can slip up anddown along the side wall 29 of thread ing chamber 5 in block R. i

Through plate H there is a tension screw pin hole which registers with pin head hole 25.

Tension screw pin A has a threaded head which is screwed into the pin head hole 25, and a reduced shank 51 which is preterably of hardened steel and passes down This screw pin A is an circled by tension sprin B between its head 50 and the top of the 'lriction plate l-I. liy turning this screw pin A, the tension on Preterably the bottom end oi screw pin A extends [into a hole 46 in the bottom friction pin F.

Friction plate H has an upwardly extending guide tongue 43 which extends from the tor-ward. part of its side edge up and'in between the front hook or guide 23 and the back hook or guide 22 in such a manner that it keeps the thread away from spring B and from beingentangled therein.

I prefer to strengthen my friction block by forming an integral sleeve 11 around the ttaching bolt hole 12. This also serves the pin-pose of lifting up the thread and helping to guide it between the friction plate and the friction pin.

I can make a close joint between the fricfriction plate in contact wit 7 wall for a substantial distance, the princlpal tion plate II and the friction pin F asshown in Fig. 1, so thata slnb indicated at 100 will be caught and the thread broken.

In Fig. 5, I show a threader block R- hav-- ing a top lOl which terminates at-the front in a guideor'nose 102 but along the back side edge'lOS has substantiallym) back guide nor back guide hook.

The friction plate M is substantially curved up atthe exposed side and has sides 18% and 185; but its base 183 is wide enough .to allow two locking teeth. 18?, 187 to projectdown on each side of friction pinF.

I can use one pin with a tooth each side butI. prefer-to use two pins preferably, of

glass orhardened steel with a tooth between them, because if one side of-the friction plate jumps the otherremains in contactwith the other pin. I

This is important especially with rayon I thread which may be one two-thousandth of an inch inthicltness but whichh as a tendency to waveif thereisinot a steady regular-friction. v

Itv is desirable that the front guide 102 should direct the thread nown onto thehorn 32 andthat the; top .lOl should slope down and across the, axial line ofthe shuttle and that the back side edge 103 should be so made as to throw any loop down below the top 83 of friction plate L,

iVhile Iipgrefer to havethe side edge. of the a thevertical side purpose isto prevent the plate from turning and it "is sufiicient if any part of the side edge Wlll engage the side wall and act as a stop. to

prevent the friction plate from turning.

I may also utilize teeth such as 187, 187 on I each side of the friction pin located between,

the screw pin A and the. side wall such as 29 or atthe opposite side ofthe screw p n, to prevent turning This. is ObJQCtlOIlZLblG. be;

cause they might unipupand wi e or crawl up over the friction pin. I I therefore prefer to'locate teeth-onthe side of the screw pin opposite thewall 29, in

such position taat the thread must pass down under them in getting into position. They serve to lock it in place and preventit from.

slipping out.

This is particularly desirable with rayon orother similar very fine wiry thread :which has a tendency to kink.

I claim: c p y 1. The combination in. a Ithreadin block for shuttles in which there a threading chamber having one substantially vertical sidewall. a top guide which extends downward into s id chamber. and a vertical threaded rew pin head hole; of a friction pinfwhich e1 ends the bottom of the threading chamber and which has a flattened top face; frictlonplatewhlch rests on the friction pin, said'frictionplate having a side edge in'contactwith said vertical side wall, a curved upwarlly projecting guide tongue positionedforward of the screw pin between the front and back of the top guide and a,

of a friction pin which ezztends acrossthe bot-e tom of the threading chamber; a friction plate which rests 'onthe friction pin, said friction plate having withsaid vertical side walha curved upward-V lyprojecting guide tongue and a tension screw side edge in contact pin hole; screw pin having Li-threaded head which is screwed'into the screw pin head hole and a shank which passesthroughihe screw in hole in the friction Jlate and a tension spring whichsurrounds the shank of the screw pin "between its head and the friction plate. 7'

3. The combination in a threadingcblock for shuttles in which is a threading chamber having a side walland a screw pin head hole;

of a friction pin which extends across thebottom. of the threading chamber; a. friction plate in operative relation with and proximate to the friction pin said friction plate having an edge in CODtflChWlfh the said side 'wall, a. curved upwardly projecting, guide tongue and a tension screw pin hole; aheaded screw pin which engages the screw. pinhead hole and which passes through the pin hole in the friction plate; and a tension spring.

which surrounds the shank of-the screwpin between its head and the friction plate.

a;The conibination in a threading block for shuttles in which a threading chan'iber having a sidewall and ascrew pin head hole; of a friction pin wl ich extends across the bot tom of the threading chamber; v a friction plate. in operative relationwith land proximate to the friction pin, saidfriction plate having a thread holding tooth in its bottom,

an edge in contactiwith the said sidewall a c curved upwardly projecting guide tongue and a tension screw pin hole; a headed screw pin which engages the screw pin head hole and which passes through the pin. hole 7 in the friction pla and a tension spring which surrounds the shank; of the screw pin bet veen itshead and the friction plate.

5; The combination in a threading block; for shuttles in which a threading chamber having a side wall and a screw pin head hole;

of a friction pin which extends across the;

bottom of the threading chamber; a friction hole; a headed screw pin Which engages the plate in operative relation with and proximate screw pin head hole and which passes through to the friction pin, said friction plate having the pin hole in the friction plate; and a ten- 10 an edge in such relation to said side wall that sion spring which surrounds the shank of the 5 it acts as a stop to prevent the friction plate screw pin between its head and the friction from revolving, a curved upwardly projeotplate. .ing guide tongue and a tension screw pin HARRY A. DAVOL. 

